Acquisitions - Schedule of Business Combinations (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2020
Business Acquisition [Line Items]
Cash payments, net of cash acquired	$ 0.0	$ 48.1
Goodwill	1,701.4		$ 1,674.5
Fiscal 2020 Acquisitions
Business Acquisition [Line Items]
Cash payments, net of cash acquired	280.3
Deferred payments, net	9.0
Contingent consideration liability	7.0
Aggregate purchase price	296.3
Net tangible assets acquired / (liabilities assumed)	(10.7)
Goodwill	185.2
Intangible assets	121.8
Shadow Financial
Business Acquisition [Line Items]
Cash payments, net of cash acquired	35.6
Deferred payments, net	2.9
Contingent consideration liability	0.0
Aggregate purchase price	38.5
Net tangible assets acquired / (liabilities assumed)	(0.2)
Goodwill	17.6
Intangible assets	21.1
Fi360
Business Acquisition [Line Items]
Cash payments, net of cash acquired	116.0
Deferred payments, net	3.5
Contingent consideration liability	0.0
Aggregate purchase price	119.5
Net tangible assets acquired / (liabilities assumed)	(7.9)
Goodwill	84.4
Intangible assets	43.1
Clear-Structure
Business Acquisition [Line Items]
Cash payments, net of cash acquired	59.1
Deferred payments, net	2.6
Contingent consideration liability	7.0
Aggregate purchase price	68.7
Net tangible assets acquired / (liabilities assumed)	0.6
Goodwill	44.2
Intangible assets	23.9
Funds-Library
Business Acquisition [Line Items]
Cash payments, net of cash acquired	69.6
Deferred payments, net	0.0
Contingent consideration liability	0.0
Aggregate purchase price	69.6
Net tangible assets acquired / (liabilities assumed)	(3.2)
Goodwill	39.0
Intangible assets	$ 33.8